Dual Full - Bridge Driver

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Dual Full - Bridge Driver

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The L298 is an integrated monolithic circuit in a 15lead Multiwatt and PowerSO20 packages. It is a high voltage, high current dual full-bridge driver designed to accept standardTTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Two enableinputs are provided to enableor disable the deviceindependentlyof the input signals. The emitters of the lower transistors of each bridge are connected together and the corresponding external terminal can be used for the conBLOCK DIAGRAM...

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Nội dung Text: Dual Full - Bridge Driver

  1. ® L298 DUAL FULL-BRIDGE DRIVER . . OPERATING SUPPLY VOLTAGE UP TO 46 V . . TOTAL DC CURRENT UP TO 4 A LOW SATURATION VOLTAGE . OVERTEMPERATURE PROTECTION LOGICAL ”0” INPUT VOLTAGE UP TO 1.5 V (HIGH NOISE IMMUNITY) DESCRIPTION PowerSO20 Multiw att15 The L298 is an integrated monolithic circuit in a 15- lead Multiwatt and PowerSO20 packages. It is a high voltage, high current dual full-bridge driver de- signed to accept standardTTL logic levels and drive O RDERING NUMBERS : L298N (Multiwatt Vert.) L298HN (Multiwatt Horiz.) inductive loads such as relays, solenoids, DC and L298P (PowerSO20) stepping motors. Two enableinputs are provided to enableor disable the deviceindependentlyof the in- put signals. The emitters of the lower transistors of nectionof an externalsensing resistor. Anadditional each bridge are connected together and the corre- supply input is provided so that the logic works at a sponding external terminal can be used for the con- lower voltage. BLOCK DIAGRAM Jenuary 2000 1/13
  2. L298 ABSOLUTE MAXIMUM RATINGS Symb ol Parameter Value Unit VS Power Supply 50 V V SS Logic Supply Voltage 7 V VI,Ven Input and Enable Voltage –0.3 to 7 V IO Peak Output Current (each Channel) – Non Repetitive (t = 100µs) 3 A –Repetitive (80% on –20% off; ton = 10ms) 2.5 A –DC Operation 2 A Vsens Sensing Voltage –1 to 2.3 V P tot Total Power Dissipation (Tcase = 75°C) 25 W Top Junction Operating Temperature –25 to 130 °C Tstg, Tj Storage and Junction Temperature –40 to 150 °C PIN CONNECTIONS (top view) 15 CURRENT SENSING B 14 OUTPUT 4 13 OUTPUT 3 12 INPUT 4 11 ENABLE B 10 INPUT 3 9 LOGIC SUPPLY VOLTAGE VSS Multiwatt15 8 GND 7 INPUT 2 6 ENABLE A 5 INPUT 1 4 SUPPLY VOLTAGE VS 3 OUTPUT 2 2 OUTPUT 1 1 CURRENT SENSING A TAB CONNECTED TO PIN 8 D95IN240A GND 1 20 GND Sense A 2 19 Sense B N.C. 3 18 N.C. Out 1 4 17 Out 4 Out 2 5 PowerSO20 16 Out 3 VS 6 15 Input 4 Input 1 7 14 Enable B Enable A 8 13 Input 3 Input 2 9 12 VSS GND 10 11 GND D95IN239 THERMAL DATA Symb ol Parameter Po werSO20 Mu ltiwatt15 Unit Rth j-case Thermal Resistance Junction-case Max. – 3 °C/W Rth j-amb Thermal Resistance Junction-ambient Max. 13 (*) 35 °C/W (*) Mounted on aluminum substrate 2/13
  3. L298 PIN FUNCTIONS (refer to the block diagram) MW.15 Po werSO Name Fun ction 1;15 2;19 Sense A; Sense B Between this pin and ground is connected the sense resistor to control the current of the load. 2;3 4;5 Out 1; Out 2 Outputs of the Bridge A; the current that flows through the load connected between these two pins is monitored at pin 1. 4 6 VS Supply Voltage for the Power Output Stages. A non-inductive 100nF capacitor must be connected between this pin and ground. 5;7 7;9 Input 1; Input 2 TTL Compatible Inputs of the Bridge A. 6;11 8;14 Enable A; Enable B TTL Compatible Enable Input: the L state disables the bridge A (enable A) and/or the bridge B (enable B). 8 1,10,11,20 GND Ground. 9 12 VSS Supply Voltage for the Logic Blocks. A100nF capacitor must be connected between this pin and ground. 10; 12 13;15 Input 3; Input 4 TTL Compatible Inputs of the Bridge B. 13; 14 16;17 Out 3; Out 4 Outputs of the Bridge B. The current that flows through the load connected between these two pins is monitored at pin 15. – 3;18 N.C. Not Connected ELECTRICAL CHARACTERISTICS (VS = 42V; VSS = 5V, Tj = 25°C; unless otherwise specified) Symbol Parameter Test Co nditions Min . Typ . Max. Unit VS Supply Voltage (pin 4) Operative Condition VIH +2.5 46 V VSS Logic Supply Voltage (pin 9) 4.5 5 7 V IS Quiescent Supply Current (pin 4) Ven = H; IL = 0 Vi = L 13 22 mA Vi = H 50 70 mA Ven = L Vi = X 4 mA ISS Quiescent Current from VSS (pin 9) Ven = H; IL = 0 Vi = L 24 36 mA Vi = H 7 12 mA Ven = L Vi = X 6 mA V iL Input Low Voltage –0.3 1.5 V (pins 5, 7, 10, 12) ViH Input High Voltage 2.3 VSS V (pins 5, 7, 10, 12) IiL Low Voltage Input Current Vi = L –10 µA (pins 5, 7, 10, 12) IiH High Voltage Input Current Vi = H ≤ VSS –0.6V 30 100 µA (pins 5, 7, 10, 12) Ven = L Enable Low Voltage (pins 6, 11) –0.3 1.5 V Ven = H Enable High Voltage (pins 6, 11) 2.3 VSS V Ien = L Low Voltage Enable Current Ven = L –10 µA (pins 6, 11) Ien = H High Voltage Enable Current Ven = H ≤ VSS –0.6V 30 100 µA (pins 6, 11) VCEsat (H) Source Saturation Voltage IL = 1A 0.95 1.35 1.7 V IL = 2A 2 2.7 V VCEsat (L) Sink Saturation Voltage IL = 1A (5) 0.85 1.2 1.6 V IL = 2A (5) 1.7 2.3 V VCEsat Total Drop IL = 1A (5) 1.80 3.2 V IL = 2A (5) 4.9 V Vsens Sensing Voltage (pins 1, 15) –1 (1) 2 V 3/13
  4. L298 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Co nditions Min . Typ . Max. Unit T1 (Vi) Source Current Turn-off Delay 0.5 V i to 0.9 I L (2); (4) 1.5 µs T2 (Vi) Source Current Fall Time 0.9 IL to 0.1 IL (2); (4) 0.2 µs T3 (Vi) Source Current Turn-on Delay 0.5 V i to 0.1 I L (2); (4) 2 µs T4 (Vi) Source Current Rise Time 0.1 IL to 0.9 IL (2); (4) 0.7 µs T5 (Vi) Sink Current Turn-off Delay 0.5 V i to 0.9 I L (3); (4) 0.7 µs T6 (Vi) Sink Current Fall Time 0.9 IL to 0.1 IL (3); (4) 0.25 µs T7 (Vi) Sink Current Turn-on Delay 0.5 V i to 0.9 I L (3); (4) 1.6 µs T8 (Vi) Sink Current Rise Time 0.1 IL to 0.9 IL (3); (4) 0.2 µs fc (Vi) Commutation Frequency IL = 2A 25 40 KHz T1 (Ven) Source Current Turn-off Delay 0.5 V en to 0.9 IL (2); (4) 3 µs T2 (Ven) Source Current Fall Time 0.9 IL to 0.1 IL (2); (4) 1 µs T3 (Ven) Source Current Turn-on Delay 0.5 V en to 0.1 IL (2); (4) 0.3 µs T4 (Ven) Source Current Rise Time 0.1 IL to 0.9 IL (2); (4) 0.4 µs T5 (Ven) Sink Current Turn-off Delay 0.5 V en to 0.9 IL (3); (4) 2.2 µs T6 (Ven) Sink Current Fall Time 0.9 IL to 0.1 IL (3); (4) 0.35 µs T7 (Ven) Sink Current Turn-on Delay 0.5 V en to 0.9 IL (3); (4) 0.25 µs T8 (Ven) Sink Current Rise Time 0.1 IL to 0.9 IL (3); (4) 0.1 µs 1) 1)Sensing voltage can be –1 V for t ≤ 50 µsec; in steady state V sens min ≥ – 0.5 V. 2) See fig. 2. 3) See fig. 4. 4) The load must be a pure resistor. Figure 1 : Typical Saturation Voltage vs. Output Figure 2 : Switching Times Test Circuits. Current. Note : For INPUT Switching, set EN = H For ENABLESwitching, set IN = H 4/13
  5. L298 Figure 3 : Source Current Delay Times vs. Input or Enable Switching. Figure 4 : Switching Times Test Circuits. Note : For INPUT Switching, set EN = H For ENABLE Switching, set IN = L 5/13
  6. L298 Figure 5 : Sink Current Delay Times vs. Input 0 V Enable Switching. Figure 6 : Bidirectional DC Motor Control. In pu ts Fu nctio n Ven = H C=H;D=L Forward C =L; D= H Reverse C=D Fast Motor Stop Ven = L C=X;D=X Free Running Motor Stop L = Low H = High X = Don’t care 6/13
  7. L298 Figure 7 : For higher currents, outputs can be paralleled. Take care to parallel channel 1 with channel 4 and channel 2 with channel 3. APPLICATION INFORMATION (Refer to the block diagram) 1.1. POWER OUTPUT STAGE Each input must be connected to the source of the TheL298integratestwo poweroutputstages(A ; B). driving signals by means of a very short path. The power output stage is a bridge configuration Turn-On and Turn-Off : Before to Turn-ON the Sup- and its outputs can drive an inductive load in com- ply Voltageand beforeto Turnit OFF, the Enablein- mon or differenzialmode, dependingon the state of put must be driven to the Low state. the inputs. The current that flows through the load comes out from the bridge at the sense output : an 3. APPLICATIONS external resistor (RSA ; RSB.) allows to detect the in- Fig 6 shows a bidirectional DC motor control Sche- tensity of this current. matic Diagram for which only one bridge is needed. The external bridge of diodes D1 to D4 is made by 1.2. INPUT STAGE four fast recovery elements (trr ≤ 200 nsec) that Each bridge is driven by means of four gates the in- must be chosen of a VF as low as possible at the put of which are In1 ; In2 ; EnA and In3 ; In4 ; EnB. worst case of the load current. The In inputs set the bridge state when The En input The sense outputvoltage can be used to control the is high ; a lowstate of the En inputinhibitsthe bridge. current amplitude by chopping the inputs, or to pro- All the inputs are TTL compatible. vide overcurrent protection by switching low the en- 2. SUGGESTIONS able input. A non inductive capacitor, usually of 100 nF, must The brake function (Fast motor stop) requires that be foreseen between both Vs and Vss, to ground, the Absolute Maximum Rating of 2 Amps must as near as possible to GND pin. When the large ca- never be overcome. pacitor of the power supply is too far from the IC, a When the repetitive peak current needed from the second smaller one must be foreseen near the load is higher than 2 Amps, a paralleled configura- L298. tion can be chosen (See Fig.7). The sense resistor, not of a wire wound type, must An external bridge of diodes are required when in- be grounded near the negative pole of Vs that must ductive loads are driven and when the inputs of the be near the GND pin of the I.C. IC are chopped; Shottkydiodeswould bepreferred. 7/13
  8. L298 This solution can drive until 3 Amps In DC operation Fig 10 shows a second two phase bipolar stepper and until 3.5 Amps of a repetitive peak current. motor control circuit where the current is controlled OnFig 8 it is shownthe driving ofa twophasebipolar by the I.C. L6506. stepper motor ; the needed signals to drive the in- puts of the L298 are generated, in this example, from the IC L297. Fig 9 shows an example of P.C.B. designed for the application of Fig 8. Figure 8 : Two Phase Bipolar Stepper Motor Circuit. This circuit drives bipolar stepper motors with winding currents up to 2 A. The diodes are fast 2 A types. RS1 = RS2 = 0.5 Ω VF ≤ 1.2 V @ I = 2 A D1 to D8 = 2 A Fast diodes { trr ≤ 200 ns 8/13
  9. L298 Figure 9 : Suggested Printed Circuit Board Layout for the Circuit of fig. 8 (1:1 scale). Figure 10 : Two Phase Bipolar Stepper Motor Control Circuit by Using the Current Controller L6506. RR and Rsense depend from the load current 9/13
  10. L298 mm inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. OUTLINE AND A 5 0.197 MECHANICAL DATA B 2.65 0.104 C 1.6 0.063 D 1 0.039 E 0.49 0.55 0.019 0.022 F 0.66 0.75 0.026 0.030 G 1.02 1.27 1.52 0.040 0.050 0.060 G1 17.53 17.78 18.03 0.690 0.700 0.710 H1 19.6 0.772 H2 20.2 0.795 L 21.9 22.2 22.5 0.862 0.874 0.886 L1 21.7 22.1 22.5 0.854 0.870 0.886 L2 17.65 18.1 0.695 0.713 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L7 2.65 2.9 0.104 0.114 M 4.25 4.55 4.85 0.167 0.179 0.191 M1 4.63 5.08 5.53 0.182 0.200 0.218 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 Multiwatt15 V Dia1 3.65 3.85 0.144 0.152 10/13
  11. L298 mm inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. OUTLINE AND A 5 0.197 MECHANICAL DATA B 2.65 0.104 C 1.6 0.063 E 0.49 0.55 0.019 0.022 F 0.66 0.75 0.026 0.030 G 1.14 1.27 1.4 0.045 0.050 0.055 G1 17.57 17.78 17.91 0.692 0.700 0.705 H1 19.6 0.772 H2 20.2 0.795 L 20.57 0.810 L1 18.03 0.710 L2 2.54 0.100 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L5 5.28 0.208 L6 2.38 0.094 L7 2.65 2.9 0.104 0.114 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 Multiwatt15 H Dia1 3.65 3.85 0.144 0.152 11/13
  12. L298 mm inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. OUTLINE AND A 3.6 0.142 MECHANICAL DATA a1 0.1 0.3 0.004 0.012 a2 3.3 0.130 a3 0 0.1 0.000 0.004 b 0.4 0.53 0.016 0.021 c 0.23 0.32 0.009 0.013 D (1) 15.8 16 0.622 0.630 D1 9.4 9.8 0.370 0.386 E 13.9 14.5 0.547 0.570 e 1.27 0.050 e3 11.43 0.450 E1 (1) 10.9 11.1 0.429 0.437 E2 2.9 0.114 E3 5.8 6.2 0.228 0.244 G 0 0.1 0.000 0.004 H 15.5 15.9 0.610 0.626 h 1.1 0.043 JEDEC MO-166 L 0.8 1.1 0.031 0.043 N 10° (max.) S 8° (max.) T 10 0.394 (1) ”D and F” do not include mold flash or protrusions. PowerSO20 - Mold flash or protrusions shall not exceed 0.15 mm (0.006”). - Critical dimensions: ”E”, ”G” and ”a3” N N R a2 A c a1 b e DETAIL B DETAIL A E e3 H DETAIL A lead D a3 slug DETAIL B 20 11 0.35 Gage Plane -C- S SEATING PLANE L G C BOTTOM VIEW (COPLANARITY) E2 E1 T E3 1 10 PSO20MEC D1 h x 45 12/13
  13. L298 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the conse- quences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi- croelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 13/13
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